关于作用在离心压缩机上的流体激振力以及由此产生的转子振动特性综述

A Review of Aerodynamically Induced Forces Acting on Centrifugal Compressors, And Resulting Vibration Characteristics of Rotors

引起离心压缩机转子非同步受迫振动的来源有许多,其中较典型的因素包括产生于压缩机气体通道中的气动力学现象。例如叶轮失速、扩压器失速(有叶片和无叶片)以及由于叶轮和扩压器不对中而产生的气流不稳定等。通常这些现象的唯一表现形式就是转子的振动信号。本文对可能引起离心压缩机转子非同步振动的诸多因素进行了回顾,并且针对每个因素的背景信息、流场细节以及其它可能存在的激励源等方面,逐一进行了描述,并在适当的情况下运用CFD技术对流场予以分析。综述中还例举了可以用来验证上述现象的空气压力的监测数据以及可以证明这些现象的存在的转子振动数据。这些数据均来自于对实际设备的的监测,例如频率和振幅等特征参数。

There are several sources of non-synchronous forced vibration of centrifugal compressor rotors. Many of the mare aerodynamic phenomena, created within the gas path of the compressor. Phenomena such as impeller stall, diffuser stall (with and without vanes), and flow instabilities caused by impeller to diffuser misalignment, are all characteristic flow disturbances that can cause forced vibration. In fact, often the only indications of these phenomena are found in the resultingrotor vibration signals.Several phenomena that can cause non-synchronous vibration are reviewed, and for each one, background information, aswell as detailed descriptions of the flow field, or other source of the excitation, is provided. This includes the use of CFDanalytical results to describe the flow where applicable.The review also includes, when available, dynamic pressure transducer test data that can be used to verify the presence of the phenomena, and rotor vibration data indicating the presence of such phenomena. This includes test data of actual machines, indicating characteristics such as frequency and amplitude.